EASA ATPL 081 Principles of Flight study guide
EASA ATPL 081 Principles of Flight · Work through your exam, one topic at a time.
Principles of Flight is one of the fourteen theoretical knowledge subjects a candidate must pass before sitting the EASA Airline Transport Pilot Licence (ATPL) examinations. The subject code 081 identifies it within the ATPL syllabus. The EASA ATPL 081 Principles of Flight study guide has 10 sections and about 4,544 words.
01Fundamentals of Aerodynamics: Atmosphere, Airflow, Bernoulli and Continuity, Two-Dimensional Flow
This domain tests whether you can turn the standard atmosphere and the conservation laws into numbers the aeroplane actually senses: density, dynamic pressure and the pressure field around a two-dimensional section. Expect ISA values, simple continuity and Bernoulli calculations, and conceptual items on streamline curvature and stagnation.
506 words, about 3 min02Airflow and Aerofoils: Lift, Drag, Pressure Distribution, Boundary Layer, Separation and Stalls
This domain tests the section itself: how camber and angle of attack build the pressure distribution, how the boundary layer responds, and where lift ends. Items typically ask you to interpret CL/alpha curves and pressure distributions, and to break drag down into its components.
497 words, about 2 min03Wings: Planform, Aspect Ratio, Wingtip Devices, High-Lift Devices, Sweep, Dihedral and Anhedral
This domain tests the finite wing: how planform sets induced drag and the stall pattern, and how sweep, dihedral and high-lift devices change the trade-offs. Items often compare configurations or ask what a device does to CLmax, drag and pitching moment.
452 words, about 2 min04Forces in Flight: Four Forces, Load Factor, Manoeuvring and Gust Loads, Turning, Climb and Descent
This domain converts aerodynamics into aeroplane performance: the balance of forces, the load factor in manoeuvres and gusts, and the geometry of turns, climbs and descents. Numerical items on load factor, bank angle, turn radius and rate are common.
415 words, about 2 min05Stability and Control: Static and Dynamic Stability, Longitudinal, Lateral and Directional
This domain tests the aeroplane's response to a disturbance and to a control input: whether the initial tendency is restoring, and whether the resulting motion dies away. Items ask you to classify stability, place the centre of gravity relative to the neutral point, and identify the dynamic modes.
456 words, about 2 min06Controls: Primary and Secondary Flight Controls, Flaps, Slats, Spoilers, Trim and Fly-by-Wire
This domain tests what each control does, what it costs, and what its secondary effects are. Items mix identification (which surface moves for a given input), handling (trim, flaps, spoilers) and modern transport concepts such as fly-by-wire laws.
422 words, about 2 min07Stalling and Spinning: Stall Recognition, Recovery, Spin Aerodynamics and Prevention
This domain tests the stall and the spin as aerodynamic events with fixed triggers and defined recoveries. Items ask for the cause, the indications, the effect of weight, load factor and configuration, and the correct recovery sequence.
395 words, about 2 min08High-Speed Flight: Compressibility, Mach Number, Shock Waves, Critical Mach, Buffet and Mach Trim
This domain covers what changes when the air can no longer be treated as incompressible: local Mach number, shock waves, wave drag and the buffet boundary. Items test Mach calculations, critical Mach, and the handling effects at high Mach.
444 words, about 2 min09Propellers: Thrust and Efficiency, Slip, Blade Angle, Constant-Speed Operation and Asymmetric Blade Effect
This domain tests the propeller as a thrust-producing device: blade angle, pitch, slip, advance ratio, the constant-speed unit, and the asymmetric effects that produce yaw. Items ask for the direction of the effects and the reason for them.
464 words, about 2 min10Limitations and Flight Envelope: V-Speeds, Structural and Aerodynamic Limits, Wake Turbulence and Windshear
This domain tests the boundaries the aeroplane must stay inside - aerodynamic, structural and operational - and the hazards that can push it out: wake turbulence and windshear. Items ask what a V-speed means, when it changes with weight, and how to avoid or escape the hazard.
493 words, about 2 min